Rishaan likes cars and associates German automobile manufacturers with high levels of quality. He drives a Volkswagen Jetta and highly values the company. Recently, Volkswagen was fined due to emissions violations in its diesel cars that only activated anti-pollution controls when they were tested. On the road, Volkswagen's diesel models emitted up to 40 times more toxic fumes than permitted by law. One of Rishaan's friends, Jeff, asked him about the Volkswagen diesel emissions problem, but Rishaan said he wasn't aware of any problems. Jeff was surprised at Rishaan's response because he distinctly remembers forwarding an article to Rishaan about the problem and discussing the issue with him. What could account for the difference between Jeff and Rishaan's recollection of this issue